• Venus tables

• lunar series correlated to eclipses of the Sun

• Mars tables

The Maya calendric system consits of:

• the Haab, a 365-day calendar approximating the solar year, having 18 months of 20 days and
  one month of 5 days;
  see my JavaScript.
  
  
• the Tzolkin, a 260-day calendar, with 20 periods of 13 days, used in the society, in rituals,
  and in religious and ceremonial events.
  see my applet or JavaScript.
  
  
• a Long Count date is specified by the number of days from a starting date (August 11, 3114 BCE in Gregorian calendar), using a base-20 and base-18 number system, consisting of 5 fields:
  
  • baktun = 144,000 days
  • katun = 7,200 days
  • tun = 360 days
  • winal = 20 days
  • kin = 1 day
  The starting date is written 0.0.0.0.0, the maximum date is 19.19.19.17.19, the Gregorian date 4772 October 12.
  

A Calendar Round is a combination of the Haab and the Tzolkin. The total number of combinations is

365 Haab days x 260 Tzolkin days = 94,900 days.

But the two calendars repeat after 52 Haab years of 365 days, because of the same number of days as in 73 Tzolkin years of 260 days:

52 · 365 = 73 · 260 = 18,980 = 94,900 : 5

Not every possible combination of Tzolkin and Haab can occur, only 1 in 5 combinations are possible.
E. g. for Tzolkin days Ajaw the Haab day can only be 3, 8, 13 or 18. To show this set the Haab calculator to 8 Kumku (the date of creation, which is 4 Ajaw in Tolkin). Then add a multiple of 20 (e.g. 380 to jump into the next cycle) leaving Ajaw unchanged.

Venus Tables

Venus motion details

Heliacal Rise of Venus

Venus was of utmost importance for the Mayas, considered to bring evil and misfortune when appearing in the morning sky.
Page (24) of the Codex at the left is an introduction to the Venus tables, listing the multiples of 2920, the period of the Venus cycle, beginning in the low right corner: